The process involves getting the ESC to know what the maximum possible speed of the motor is with full batteries and remembering it.

Then you choose a Flat Throttle line 80% or 85% or whatever... that corresponds to the head speed you want. (You need to do this with a tach)

Now the ESC will always attempt to give you that head speed no matter what level the batteries are at.

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Regular Gov on the YGE determine top head speed available with the current charge of the battery, so it can be inconsistent flight to flight, especially if you land after a minute of two and start again.